Combined fluid fuel burning heater and incinerator



July 3l 1934 w. w. WILLIAMS 1,968,581

COIBINED FLUID FUEL BURNING HEATER AND INCINERATOR Filed June 30,; 1933 INVENToR. Mm TER w. n//L 1 MM5 BY n? 7,7m M j ATTORNEYS.

Patented July 31, 1934 UNITED STATES PATENT OFFICE Application June 30, 1933, Serial No. 678,346

3 Claims.

haces and more particularly the combination of a iluid fuel burning furnace for a domestic hot air heating system with means for utilizing I the same as an incinerator for domestic rubbish.

It is an object of this invention to provide a commercial type of hot air heating furnace with iluid fuel burner to supplant the burning of coal therein in combination vwith the provision of means whereby the furnace may be utilized for a domestic incinerator without suspending the operation of the fluid fuel burner.

The advantages of such a combination are obvious. The invention may be applied to any commercial hot air furnace without removing the grate provided for solid fuel and the burning of refuse takes place on the grate without the necessity of suspending the operation of the burner when it is desired to deposit refuse in-the furnace.

With these and other objects in view reference is made to the accompanying sheet of drawing illustrating an embodiment of this invention with the understanding that minor detailed changes may be made therein without departing from the scope thereof.

'I'he figure upon the drawing is a view partly in central vertical section and partly in elevation of a commercial hot air furnace, such as il1uslo trated in the current catalogs of the Holland Furnace Company, to which this invention has been applied.

As shown, the furnace of commercial construction; includes a vertically elongated combustion radiator 2 through which the heated gases of combustion pass which radiator is connected by a flue 3 to the stack or chimney not shown. A conical grate 3 is mounted at the bottom of the combustion chamber 1 and is spaced apart from the bottom of the furnace as shown. The combustion chamber 1 and radiator 2 are surrounded by a cylindrical casing 4 which casing is provided with a cold air intake 5 at the bottom. The top of the casing 6 is closed and is provided with a plurality of hot air ducts 'I leading `to the heating system. The walls of the combustion chamber 1 at one side are extended to pass through the outer casing 4 forming a passageway 8 for the insertion of solid fuel and is customarily closed upon the exterior of the casing by a fire door. The walls of the ash pit 9 below the grate are also extended at one side through the outer casing 4 for the removal of ashes and is customarily closed by ash door 10.

chamber 1 which opens at the top into an annular This invention relates to improvements in fur- This invention contemplates the application of a fluid fuel burner B mounted upon a plate l1 in lieu of the customary flre door, and the coal passage is lined with refractory material 12 to form a combustion chamber 13 for a fluid fuel 60 flame. The fluid fuel burner is preferably of the construction illustrated in the applicants prior co-pending application, Serial No. 662,711, filed March 25, 1933, which produces a short length flame. If desired the customary fire door opening upon the exterior of the casing may be reinforced by a channel 14 to which the plate 11 supporting the burner B may be secured in any desired manner. A short cylindrical draft pipe 15 for the burner extends through the plate 11 70 and the refractory lining 12 fills the space from the inner side of the plate 11 to the inner extremity of the draft pipe, as shown, and is then extended on the interior of the passage 8 and terminated at the entrance of this passage to the combustion chamber 1.

By applying a fluid fuel burner in lieu of the coal door of the furnace in the manner above described the temperature of the combustion chamber 1 will be increased in the same manner as 30v if a coal flre were burning upon the grate and it is seen that there is no necessity of removing the customary grate for the application of the fluid fuel burner.

Heretofore it has been the custom in applying 35 fluid fuel burners to remove the grate and lining part of the combustion chamber and the ash pit with refractory material and apply the fluid fuel burner through the ash door of the furnace.

The application of a fluid fuel burner in the manner above'described, in which the grate remains in the furnace, will allow the grate to be employed as an incinerator and to this end this invention contemplates the extending of the walls of the combustion chamber 1 through the outer 95 casing 14 to provide a passage-way 16 for the insertion of domestic rubbish. This passage-Way may be located at any desired position in relation to the burner but necessarily must be at one side thereof. For convenience it is illustrated upon the drawing as being oppositely disposed. The passage-way 16 is provided with a refuse door 17 upon the exterior-of the casing 4. According to this invention the passage-way 16 is angularly disposed in relation to the combustion chamber 1, not only for the convenience of inserting rubbish but also the top of the passage-way is arranged below the axis of the fluid burning nozzle of the burner B, to insure the flame therefrom, in the event that it extends into the combustion chamber, to pass upward toward the radiator 3 and not enter the refuse passage 16.

It is also preferable to provide the ash pit door 10 with an asbestos gasket and likewise the refuse door 17 to insure during normal operation of the fluid fuel burner that no excess air enter the combustion chamber 1. When it is desired to incinerate refuse the same is admitted through the door 1'7 and refuse dumped into the sloping refuse chute 16 is delivered upon the grate 3. The intense heat from the fluid flame will ignite the refuse if it be normally inflammable. If the refuse be moist, such as garbage, the intense heat will rst desiccate the refuse and then ignite it. The burned refuse may be removed through the ash pit door in the usual manner after shaking the grate if necessary. During the seasons or such times at which the fuel burner is not normally operating, refuse may be incinerated in the furnace by opening the ash pit door and igniting the same in the usual manner through the refuse door 1'7, or the fluid burner may be operated until the refuse is incinerated.

It is seen that by this construction a hot air furnace may be provided with a fluid fuel burner and at the same time employed as an incinerator, whether the burner is in operation or not, without removal of the burner from its normal fixed position.

What I claim is:-

1. In a hot air furnace having a combustion chamber surrounded by a spaced apart air circulating casing, a grate below the combustion chamber, an ash pit thereunder, an ash removing passageway communicating with the ashpit and having a door on the exterior of the casing; a fuel feed passageway leading from the exterior of the casing communicating with the interior of the combustion chamber in combination with a fluid fuel burner mounted over the ex* terior of the fuel feed opening, and a rubbish chute having a refuse door on the exterior of the casing at one end and communicating with the combustion chamber above the grate at the other end.

chamber surrounded by a spaced apart air circulating casing, a grate below the combustion chamber, an ash pit thereunder, an ash removing passageway communicating with the ashpit and having a door on the exterior of the casing; a fuel feed passageway leading from the exterior of the casing communicating with the interior of the combustion chamber in combination with a uid fuel burner mounted over the exterior of the fuel feed opening provided with a refractory combustion chamber within the fuel feed communicating passage to the combustion chamber, and an inclinedrubbish chute having a refuse door on the exterior of the casing at one end and communicating with the combustion chamber above the grate at the other end.

3. In a hot air furnace having a combustion chamber surrounded by a spaced apart air circulating casing, a grate below the combustion chamber, an ash pit thereunder, an ash removing passageway communicating with the ashpit, and having a door on the exterior of the casing, a fuel feed passageway leading from the exterior of the casing communicating with the interior of the combustion chamber, in combination with a fluid fuel burner mounted over the exterior of the fuel feed opening provided with a refractory combustion chamber Within the fuel feed communicating passage to the furnace combustion chamber, and an inclined rubbish chute having at one end a refuse door on the exterior of the casing, said chute communicating with the furnace combustion chamber above the grate and below the axis of the burner nozzle at the other end whereby refuse may be incinerated independently of the operation of the burner.

WALTER W. WILLIAMS.

2. In aV hot air furnace having a combustion lli) 

